. Railway organization and working; a series of lectures delivered before the railway classes of the University of Chicago . , or the pushingand pulling alternately of the cars by the switch-engine;(b) a poling-yardj or one in which the classifying isdone on inclined tracks—the switch-engine, with a pole,running on a track parallel to the lead-track, starts thecuts down the grade, whence they run by their com-bined momentum, aided by gravity, into the assignedtrack in the classification-yard; (c) the summit- orhump-yard, in which the cars are run to the summitof a grade, which rapidly descends
. Railway organization and working; a series of lectures delivered before the railway classes of the University of Chicago . , or the pushingand pulling alternately of the cars by the switch-engine;(b) a poling-yardj or one in which the classifying isdone on inclined tracks—the switch-engine, with a pole,running on a track parallel to the lead-track, starts thecuts down the grade, whence they run by their com-bined momentum, aided by gravity, into the assignedtrack in the classification-yard; (c) the summit- orhump-yard, in which the cars are run to the summitof a grade, which rapidly descends into the classifica-tion-yard, the cars, after being detached at the summit,running down, under the action of gravity, into the as-signed classification-tracks. The utility of these threetypes of classifications is best exemplified by the follow-ing record of a test made in classifying a sixty-car trainby each of the three methods: Level Poling Hump 60 5o 52 hrs. $ 60 50 9 1 hr. 15 m. $i-55 60 Number of cuts 50 9 30 m. $ Number of men Time consumed Wage expense The summit- or hump-yard has become a necessity.
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Keywords: ., bookauthordewsnupe, bookcentury1900, bookdecade1900, bookyear1906
